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48 lines
1.2 KiB
48 lines
1.2 KiB
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#pragma once
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#include <llvm/IR/IRBuilder.h>
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#include <libevmface/Instruction.h>
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namespace evmcc
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{
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class GasMeter
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{
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public:
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GasMeter(llvm::IRBuilder<>& _builder, llvm::Module* module);
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GasMeter(const GasMeter&) = delete;
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void operator=(GasMeter) = delete;
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/// Count step cost of instruction
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void count(dev::eth::Instruction _inst);
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/// Calculate & count gas cost for SSTORE instruction
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void countSStore(class Ext& _ext, llvm::Value* _index, llvm::Value* _newValue);
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/// Finalize cost-block by checking gas needed for the block before the block
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/// @param _additionalCost adds additional cost to cost-block before commit
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void commitCostBlock(llvm::Value* _additionalCost = nullptr);
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/// Give back an amount of gas not used by a call
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void giveBack(llvm::Value* _gas);
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/// Generate code that checks the cost of additional memory used by program
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void checkMemory(llvm::Value* _additionalMemoryInWords, llvm::IRBuilder<>& _builder);
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llvm::Value* getGas();
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private:
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/// Cumulative gas cost of a block of instructions
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/// @TODO Handle overflow
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uint64_t m_blockCost = 0;
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llvm::IRBuilder<>& m_builder;
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llvm::CallInst* m_checkCall = nullptr;
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llvm::GlobalVariable* m_gas;
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llvm::Function* m_rtExit;
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llvm::Function* m_gasCheckFunc;
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};
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}
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